<template>
    <div>
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品分类</el-breadcrumb-item>
        </el-breadcrumb>
        <!--卡片视图-->
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
                </el-col>
            </el-row>
            <!--表格-->
            <tree-table 
            class="treeTable"
            :data="catelist" 
            :columns="columns"
            :selection-type="false"
            :expand-type="false"
            :show-row-hover="false"
            show-index
            index-text="#"
            border>
                <!--是否有效-->
                <template slot="isok" slot-scope="scope">
                    <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color:lightgreen;"></i>
                    <i class="el-icon-error" v-else style="color:red"></i>
                </template>
                <!--排序-->
                <template slot="order" slot-scope="scope">
                    <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
                    <el-tag size="mini" type="success" v-else-if="scope.row.cat_level===1">二级</el-tag>
                    <el-tag size="mini" type="warning" v-else>三级</el-tag>
                </template>
                <!--操作-->
                <template slot="opt" slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                </template>
            </tree-table>
            <!--分页-->
            <el-pagination
            @size-change="handleSizeChange"
            @current-change="handleCurrentChange"
            :current-page="querInfo.pagenum"
            :page-sizes="[3,5,10,15]"
            :page-size="querInfo.pagesize"
            :total="total"
            layout="total, sizes, prev, pager, next, jumper">

            </el-pagination>
            <!--添加分类对话框-->
        <el-dialog
        title="添加分类"
        :visible.sync="addCateDialogVisible"
        width="50%"
        @close="addCateDialogClosed">
            <el-form
            :model="addCateForm"
            :rules="addCateFormRules"
            ref="addCateFormRef"
            label-width="100px">
                <el-form-item label="分类名称" prop="cat_name">
                    <el-input v-model="addCateForm.cat_name"></el-input>
                </el-form-item>
                <el-form-item label="父级分类">
                    <el-cascader
                    expand-trigger="hover"
                    :options="parentCateList"
                    :props="cascaderProps"
                    v-model="selectedKeys"
                    @change="parentCateChanged"
                    clearable
                    change-on-select>
                    </el-cascader>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addCateDialogVisible = false">取消</el-button>
                <el-button type="primary" @click="addCate">确定</el-button>
            </span>
        </el-dialog>
        </el-card>
        
    </div>
</template>

<script>
export default {
    data(){
        return{
            //查询条件
            querInfo:{
                type:3,
                pagenum:1,
                pagesize:5
            },
            //商品分类数据
            catelist:[],
            //总数据条数
            total:0,
            //为table指定列的定义
            columns:[{
                label:'分类名称',
                prop:'cat_name'
            },{
                label:'是否有效',
                type:'template',
                template:'isok'
            },{
                label:'排序',
                type:'template',
                template:'order'
            },{
                label:'操作',
                type:'template',
                template:'opt'
            }],
            //添加分类对话框显示隐藏
            addCateDialogVisible:false,
            //添加分类表单对象
            addCateForm:{
                cat_name:'',
                //父级分类id
                cat_pid:0,
                //分类等级默认添加1级分类
                cat_level:0
            },
            //添加分类表单验证规则对象
            addCateFormRules:{
                cat_name:[
                    {required:true,message:'请输入分类名称',trigger:'blur'}
                ]
            },
            //父级数据列表
            parentCateList:[],
            //指定级联选择器的配置对象
            cascaderProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            //选中父级分类id数组
            selectedKeys:[]
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //商品分类数据
        async getCateList(){
            const {data:res} = await this.$http.get('categories',{params:this.querInfo})
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败')
            }
            //console.log(res.data)
            this.catelist = res.data.result
            this.total = res.data.total
        },
        //监听pagesize改变
        handleSizeChange(newSize){
            this.querInfo.pagesize = newSize
            this.getCateList()
        },
        //监听pagenum改变
        handleCurrentChange(newPage){
            this.querInfo.pagenum = newPage
            this.getCateList()
        },
        //点击显示对话框
        showAddCateDialog(){
            this.getParentCateList()
            this.addCateDialogVisible = true;
        },
        //获取父级分类的数据列表
        async getParentCateList(){
            const {data:res} = await this.$http.get('categories',{
                params:{type:2}
            })
            if(res.meta.status !== 200){
                return this.$message.error('获取父级分类数据失败')
            }
            console.log(res.data)
            this.parentCateList = res.data
        },
        // 选择项发生变化触发
        parentCateChanged(){
            console.log(this.selectedKeys)
            if(this.selectedKeys.length > 0){
                this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
                this.addCateForm.cat_level = this.selectedKeys.length
                return
            }else{
                this.addCateForm.cat_pid = 0
                this.addCateForm.cat_level = 0
            }
        },
        //确定按钮
        addCate(){
           this.$refs.addCateFormRef.validate(async valid => {
               if(!valid) return
               const {data:res} = await this.$http.post('catgories',this.addCateForm)
               if(res.meta.status !== 201){
                   return this.$message.error('添加分类失败')
               }
               this.$message.success('添加分类成功')
               this.getCateList()
               this.addCateDialogVisible = false
           })
        },
        //监听对话框关闭事件
        addCateDialogClosed(){
            this.$refs.addCateFormRef.resetFilds()
            this.selectedKeys = []
            this.addCateForm.cat_level = 0
            this.addCateForm.cat_pid = 0
        }
    }
}
</script>

<style lang="less" scoped>
.treeTable{
    margin-top:15px;
}
.el-cascader{
    width:100%;
}
</style>